linux-kernel - Re: [PATCH 4.19 092/229] once: add DO_ONCE

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Message-ID: <CAMSo37XApZ_F5nSQYWFsSqKdMv_gBpfdKG3KN1TDB+QNXqSh0A@mail.gmail.com>
Date:   Tue, 1 Nov 2022 14:07:35 +0800
From:   Yongqin Liu <yongqin.liu@...aro.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Eric Dumazet <edumazet@...gle.com>, Willy Tarreau <w@....eu>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Benjamin Copeland <ben.copeland@...aro.org>,
        Daniel Díaz <daniel.diaz@...aro.org>
Subject: Re: [PATCH 4.19 092/229] once: add DO_ONCE_SLOW() for sleepable contexts

Hello,

As mentioned in the thread for the 5.4 version here[1], it causes a
crash for the 4.19 kernel too.
Just paste the log here for reference:

[ 1375.219830] wlan0: authenticate with 98:da:c4:4f:77:11
[ 1375.230257] wlan0: send auth to 98:da:c4:4f:77:11 (try 1/3)
[ 1375.262598] wlan0: authenticated
[ 1375.267766] wlan0: associate with 98:da:c4:4f:77:11 (try 1/3)
[ 1375.285716] wlan0: RX AssocResp from 98:da:c4:4f:77:11
(capab=0x1411 status=0 aid=1)
[ 1375.310066] wlan0: associated
[ 1375.332056] wlcore: Association completed.
[ 1376.105149] Unable to handle kernel write to read-only memory at
virtual address ffffff80092a6f18
[ 1376.114129] Mem abort info:
[ 1376.117072]   ESR = 0x9600004f
[ 1376.120138]   Exception class = DABT (current EL), IL = 32 bits
[ 1376.126091]   SET = 0, FnV = 0
[ 1376.129147]   EA = 0, S1PTW = 0
[ 1376.132301] Data abort info:
[ 1376.135176]   ISV = 0, ISS = 0x0000004f
[ 1376.139012]   CM = 0, WnR = 1
[ 1376.141997] swapper pgtable: 4k pages, 39-bit VAs, pgdp = 00000000a9880db2
[ 1376.148923] [ffffff80092a6f18] pgd=000000021fffe003,
pud=000000021fffe003, pmd=000000021fffb003, pte=00600000012a6793
[ 1376.159550] Internal error: Oops: 9600004f [#1] PREEMPT SMP
[ 1376.165119] Modules linked in:
[ 1376.168168] Process TlsVerify_100 (pid: 5454, stack limit =
0x0000000025f9c863)
[ 1376.175472] CPU: 5 PID: 5454 Comm: TlsVerify_100 Not tainted
4.19.262-g8479d939a3b0 #1
[ 1376.183381] Hardware name: HiKey960 (DT)
[ 1376.187295] pstate: 60400005 (nZCv daif +PAN -UAO)
[ 1376.192085] pc : __do_once_slow_done+0x14/0x98
[ 1376.196535] lr : __inet_hash_connect+0x480/0x484
[ 1376.201146] sp : ffffff800e203b80
[ 1376.204460] x29: ffffff800e203b80 x28: 0000000000000000
[ 1376.209768] x27: 0000000000006e48 x26: 0000000000000000
[ 1376.215071] x25: ffffff80098e6000 x24: 9b29771fbf0b881c
[ 1376.220375] x23: ffffff8009766600 x22: ffffff8009766bc0
[ 1376.225678] x21: ffffff8008c34198 x20: ffffff80098e65c0
[ 1376.230982] x19: ffffffc04cabd1c0 x18: 0000000005c65eec
[ 1376.236285] x17: 00000000175fece9 x16: 0000000071679066
[ 1376.241588] x15: 00000000467bf177 x14: 000000005f331e5c
[ 1376.246891] x13: 0000000000000014 x12: 00000000b82286ab
[ 1376.252194] x11: 0000000084c874ea x10: 00000000fdb36642
[ 1376.257497] x9 : 68962c3381a87000 x8 : 0000000000000001
[ 1376.262800] x7 : 0000000000000000 x6 : ffffffc2197c0000
[ 1376.268103] x5 : 000000008113af5d x4 : 0000000000000008
[ 1376.273406] x3 : 0000000000000030 x2 : 0000000000000000
[ 1376.278709] x1 : ffffff800976e568 x0 : ffffff80092a6f18
[ 1376.284012] Call trace:
[ 1376.286456]  __do_once_slow_done+0x14/0x98
[ 1376.290544]  __inet_hash_connect+0x480/0x484
[ 1376.294805]  inet_hash_connect+0x48/0x54
[ 1376.298720]  tcp_v4_connect+0x26c/0x3e4
[ 1376.302549]  __inet_stream_connect+0x2ac/0x308
[ 1376.306984]  inet_stream_connect+0x44/0x68
[ 1376.311072]  __sys_connect+0xb4/0x100
[ 1376.314725]  __arm64_sys_connect+0x1c/0x28
[ 1376.318816]  el0_svc_common+0xa4/0x188
[ 1376.322556]  el0_svc_handler+0x60/0x68
[ 1376.326298]  el0_svc+0x8/0x300
[ 1376.329345] Code: f9000bf5 a9024ff4 910003fd 52800028 (39000008)
[ 1376.335431] ---[ end trace 28410d3ffccfb491 ]---
[ 1376.351416] Kernel panic - not syncing: Fatal exception
[ 1376.356640] SMP: stopping secondary CPUs
[ 1376.360775] Kernel Offset: disabled
[ 1376.364257] CPU features: 0x10,20082004
[ 1376.368083] Memory Limit: none
[ 1376.382434] Rebooting in 5 seconds..

[1]: https://lore.kernel.org/lkml/20221029011211.4049810-1-ovt@google.com/

Thanks,
Yongqin Liu